<!DOCTYPE html>
<html>
	<head>
		<meta http-equiv="content-type" content="text/html; charset=UTF-8">
		<meta name="viewport" content="width=device-width,minimum-scale=1.0,maximum-scale=1.0,user-scalable=no" />
		<meta charset="UTF-8">
		<title></title>
		<style type="text/css">
			body,
			html {
				margin: 0;
				width: 100%;
				overflow: hidden;
				background: #000000;
			}
			canvas {
				position: absolute;
				width: 100%;
			}
			.control {
				position: absolute;
			}
			.control input {
				border: 0;
				margin: 0;
				padding: 15px;
				outline: none;
				text-align: center;
			}
			.control button {
				border: 0;
				margin: 0;
				padding: 15px;
				outline: none;
				background: #333;
				color: #fff;
			}
			.control button:focus,
			.control button:hover {
				background: #222
			}
		</style>
		<script src="http://static.test.itmtr.cn/jquery/jquery-3.4.1.min.js" type="text/javascript" charset="utf-8"></script>
		<link href="http://static.test.itmtr.cn/layui/css/layui.css" rel="stylesheet" />
		<script src="http://static.test.itmtr.cn/layui/layui.js" type="text/javascript" charset="utf-8"></script>
		<script src="http://static.test.itmtr.cn/main.js" type="text/javascript" charset="utf-8"></script>
	</head>


	<body>
		<div class="control" style="position:absolute">
		</div>
		<script type="text/javascript">
			var yanhua = function(name) {
				var can = document.createElement("canvas");
				document.body.appendChild(can);
				var ctx = can.getContext('2d');
				var Fireworks = function() {
					var self = this;
					var rand = function(rMi, rMa) {
						return ~~((Math.random() * (rMa - rMi + 1)) + rMi);
					}
					var hitTest = function(x1, y1, w1, h1, x2, y2, w2, h2) {
						return !(x1 + w1 < x2 || x2 + w2 < x1 || y1 + h1 < y2 || y2 + h2 < y1);
					};
					self.init = function() {
						self.canvas = document.createElement('canvas');
						self.canvas.width = self.cw = $(window).innerWidth();
						self.canvas.height = self.ch = $(window).innerHeight();
						self.particles = [];
						self.partCount = 150;
						self.fireworks = [];
						self.mx = self.cw / 2;
						self.my = self.ch / 2;
						self.currentHue = 30;
						self.partSpeed = 5;
						self.partSpeedVariance = 10;
						self.partWind = 50;
						self.partFriction = 5;
						self.partGravity = 1;
						self.hueMin = 0;
						self.hueMax = 360;
						self.fworkSpeed = 4;
						self.fworkAccel = 10;
						self.hueVariance = 30;
						self.flickerDensity = 25;
						self.showShockwave = true;
						self.showTarget = false;
						self.clearAlpha = 25;
						$(document.body).append(self.canvas);
						self.ctx = self.canvas.getContext('2d');
						self.ctx.lineCap = 'round';
						self.ctx.lineJoin = 'round';
						self.lineWidth = 1;
						self.bindEvents();
						self.canvasLoop();
						self.canvas.onselectstart = function() {
							return false;
						};
					};
					self.createFireworks = function(startX, startY, targetX, targetY) {
						var newFirework = {
							x: startX,
							y: startY,
							startX: startX,
							startY: startY,
							hitX: false,
							hitY: false,
							coordLast: [{
									x: startX,
									y: startY
								},
								{
									x: startX,
									y: startY
								},
								{
									x: startX,
									y: startY
								}
							],
							targetX: targetX,
							targetY: targetY,
							speed: self.fworkSpeed,
							angle: Math.atan2(targetY - startY, targetX - startX),
							shockwaveAngle: Math.atan2(targetY - startY, targetX - startX) + (90 * (Math.PI / 180)),
							acceleration: self.fworkAccel / 100,
							hue: self.currentHue,
							brightness: rand(50, 80),
							alpha: rand(50, 100) / 100,
							lineWidth: self.lineWidth
						};
						self.fireworks.push(newFirework);
					};
					self.canvasLoop = function() {
						window.requestAnimationFrame(self.canvasLoop, self.canvas);
						self.ctx.globalCompositeOperation = 'destination-out';
						self.ctx.fillStyle = 'rgba(0,0,0,' + self.clearAlpha / 100 + ')';
						self.ctx.fillRect(0, 0, self.cw, self.ch);
						self.updateFireworks();
						self.updateParticles();
						self.drawFireworks();
						self.drawParticles();
					};
					self.drawParticles = function() {
						var i = self.particles.length;
						while (i--) {
							var p = self.particles[i];
							var coordRand = (rand(1, 3) - 1);
							self.ctx.beginPath();
							self.ctx.moveTo(Math.round(p.coordLast[coordRand].x), Math.round(p.coordLast[coordRand].y));
							self.ctx.lineTo(Math.round(p.x), Math.round(p.y));
							self.ctx.closePath();
							self.ctx.strokeStyle = 'hsla(' + p.hue + ', 100%, ' + p.brightness + '%, ' + p.alpha + ')';
							self.ctx.stroke();
							if (self.flickerDensity > 0) {
								var inverseDensity = 50 - self.flickerDensity;
								if (rand(0, inverseDensity) === inverseDensity) {
									self.ctx.beginPath();
									self.ctx.arc(Math.round(p.x), Math.round(p.y), rand(p.lineWidth, p.lineWidth + 3) / 2, 0, Math.PI * 2,
										false)
									self.ctx.closePath();
									var randAlpha = rand(50, 100) / 100;
									self.ctx.fillStyle = 'hsla(' + p.hue + ', 100%, ' + p.brightness + '%, ' + randAlpha + ')';
									self.ctx.fill();
								}
							}
						};
					};
					self.drawFireworks = function() {
						var i = self.fireworks.length;
						self.ctx.globalCompositeOperation = 'lighter';
						while (i--) {
							var f = self.fireworks[i];
							self.ctx.lineWidth = f.lineWidth;
							var coordRand = (rand(1, 3) - 1);
							self.ctx.beginPath();
							self.ctx.moveTo(Math.round(f.coordLast[coordRand].x), Math.round(f.coordLast[coordRand].y));
							self.ctx.lineTo(Math.round(f.x), Math.round(f.y));
							self.ctx.closePath();
							self.ctx.strokeStyle = 'hsla(' + f.hue + ', 100%, ' + f.brightness + '%, ' + f.alpha + ')';
							self.ctx.stroke();
							if (self.showTarget) {
								self.ctx.save();
								self.ctx.beginPath();
								self.ctx.arc(Math.round(f.targetX), Math.round(f.targetY), rand(1, 8), 0, Math.PI * 2, false)
								self.ctx.closePath();
								self.ctx.lineWidth = 1;
								self.ctx.stroke();
								self.ctx.restore();
							}
							if (self.showShockwave) {
								self.ctx.save();
								self.ctx.translate(Math.round(f.x), Math.round(f.y));
								self.ctx.rotate(f.shockwaveAngle);
								self.ctx.beginPath();
								self.ctx.arc(0, 0, 1 * (f.speed / 5), 0, Math.PI, true);
								self.ctx.strokeStyle = 'hsla(' + f.hue + ', 100%, ' + f.brightness + '%, ' + rand(25, 60) / 100 + ')';
								self.ctx.lineWidth = f.lineWidth;
								self.ctx.stroke();
								self.ctx.restore();
							}
						};
					};
					self.updateFireworks = function() {
						var i = self.fireworks.length;
						while (i--) {
							var f = self.fireworks[i];
							self.ctx.lineWidth = f.lineWidth;
							vx = Math.cos(f.angle) * f.speed,
								vy = Math.sin(f.angle) * f.speed;
							f.speed *= 1 + f.acceleration;
							f.coordLast[2].x = f.coordLast[1].x;
							f.coordLast[2].y = f.coordLast[1].y;
							f.coordLast[1].x = f.coordLast[0].x;
							f.coordLast[1].y = f.coordLast[0].y;
							f.coordLast[0].x = f.x;
							f.coordLast[0].y = f.y;
							if (f.startX >= f.targetX) {
								if (f.x + vx <= f.targetX) {
									f.x = f.targetX;
									f.hitX = true;
								} else {
									f.x += vx;
								}
							} else {
								if (f.x + vx >= f.targetX) {
									f.x = f.targetX;
									f.hitX = true;
								} else {
									f.x += vx;
								}
							}
							if (f.startY >= f.targetY) {
								if (f.y + vy <= f.targetY) {
									f.y = f.targetY;
									f.hitY = true;
								} else {
									f.y += vy;
								}
							} else {
								if (f.y + vy >= f.targetY) {
									f.y = f.targetY;
									f.hitY = true;
								} else {
									f.y += vy;
								}
							}
							if (f.hitX && f.hitY) {
								self.createParticles(f.targetX, f.targetY, f.hue);
								self.fireworks.splice(i, 1);
							}
						};
					};
					self.createParticles = function(x, y, hue) {
						var countdown = self.partCount;
						while (countdown--) {
							var newParticle = {
								x: x,
								y: y,
								coordLast: [{
										x: x,
										y: y
									},
									{
										x: x,
										y: y
									},
									{
										x: x,
										y: y
									}
								],
								angle: rand(0, 360),
								speed: rand(((self.partSpeed - self.partSpeedVariance) <= 0) ? 1 : self.partSpeed - self.partSpeedVariance,
									(self.partSpeed + self.partSpeedVariance)),
								friction: 1 - self.partFriction / 100,
								gravity: self.partGravity / 2,
								hue: rand(hue - self.hueVariance, hue + self.hueVariance),
								brightness: rand(50, 80),
								alpha: rand(40, 100) / 100,
								decay: rand(10, 50) / 1000,
								wind: (rand(0, self.partWind) - (self.partWind / 2)) / 25,
								lineWidth: self.lineWidth
							};
							self.particles.push(newParticle);
						}
					};
					self.updateParticles = function() {
						var i = self.particles.length;
						while (i--) {
							var p = self.particles[i];
							var radians = p.angle * Math.PI / 180;
							var vx = Math.cos(radians) * p.speed;
							var vy = Math.sin(radians) * p.speed;
							p.speed *= p.friction;
							p.coordLast[2].x = p.coordLast[1].x;
							p.coordLast[2].y = p.coordLast[1].y;
							p.coordLast[1].x = p.coordLast[0].x;
							p.coordLast[1].y = p.coordLast[0].y;
							p.coordLast[0].x = p.x;
							p.coordLast[0].y = p.y;
							p.x += vx;
							p.y += vy;
							p.y += p.gravity;
							p.angle += p.wind;
							p.alpha -= p.decay;
							if (!hitTest(0, 0, self.cw, self.ch, p.x - p.radius, p.y - p.radius, p.radius * 2, p.radius * 2) || p.alpha <
								.05) {
								self.particles.splice(i, 1);
							}
						};
					};
					self.bindEvents = function() {
						$(self.canvas).on('mousedown', function(e) {
							self.mx = e.pageX - self.canvas.offsetLeft;
							self.my = e.pageY - self.canvas.offsetTop;
							self.currentHue = rand(self.hueMin, self.hueMax);
							self.createFireworks(self.cw / 2, self.ch, self.mx, self.my);
						});
						$(self.canvas).on('mouseup', function(e) {
							$(self.canvas).off('mousemove.fireworks');
						});
					};
					self.init();
				}

				function resize() {
					can.width = window.innerWidth;
					can.height = window.innerHeight;
				}
				const max_radius = 3;
				const min_radius = 1;
				//粒子大小
				const drag = 50;
				window.onresize = function() {
					resize();
				};

				function cfill() {
					ctx.fillStyle = "#000";
					ctx.fillRect(0, 0, can.width, can.height);
					ctx.fill();
				}
				resize();
				cfill();
				class Particle {
					constructor(pos, target, vel, color, radius) {
						this.pos = pos;
						this.target = target;
						this.vel = vel;
						this.color = color;
						this.radius = radius;
						this.direction = 0;
					}
					set(type, value) {
						this[type] = value;
					}

					update() {
						this.radius = 2;
						this.vel.x = (this.pos.x - this.target.x) / drag;
						this.vel.y = (this.pos.y - this.target.y) / drag;
						this.pos.x -= this.vel.x;
						this.pos.y -= this.vel.y;
					}
					draw() {
						ctx.beginPath();
						ctx.fillStyle = this.color;
						ctx.arc(this.pos.x, this.pos.y, this.radius, 0, Math.PI * 2);
						ctx.fill();
					}
				}
				var particles = [];
				var colors = ["#bf1337", "#f3f1f3", "#084c8d", "#f2d108", "#efd282"];
				var bool = true;
				var current = 0,
					i;

				function changeText(text) {
					var current = 0,
						temp, radius, color;
					ctx.fillStyle = "#fff";
					ctx.font = "160px 楷体";
					ctx.fillText(text, can.width * 0.5 - ctx.measureText(text).width * 0.5, can.height * 0.5 + 60);
					var data = ctx.getImageData(0, 0, can.width, can.height).data;
					cfill();
					for (i = 0; i < data.length; i += 12) {
						if (data[i] !== 0 && (Math.random() * 10) >= 8.8) {
							radius = max_radius - Math.random() * min_radius;
							temp = {
								x: (i / 4) % can.width,
								y: ((i / 4) / can.width)
							};
							color = colors[0];
							var p = new Particle(
								temp, {
									x: (i / 4) % can.width,
									y: ((i / 4) / can.width)
								}, {
									x: 0,
									y: 0
								},
								color,
								radius);
							particles.push(p);
							++current;
						}
					}
					particles.splice(current, particles.length - current);
				}

				function draw(obj) {
					ctx.beginPath();
					ctx.arc(obj.target.x, obj.target.y, obj.radius, 0, 2 * Math.PI);
					ctx.fillStyle = obj.color;
					ctx.fill();
				}
				changeText(name);
				var t = 0;
				var id;
				var fworks = new Fireworks();

				function init() {
					id = window.requestAnimationFrame(init)
					if (t >= particles.length - 1) {
						window.cancelAnimationFrame(id)
					}
					draw(particles[t])
					t++;
					var rand = function(rMi, rMa) {
						return ~~((Math.random() * (rMa - rMi + 1)) + rMi);
					}
					if (t % 5 == 0) {
						fworks.currentHue = rand(0, 360);
						fworks.createFireworks($(window).innerWidth() / 2, $(window).innerHeight(), particles[t].pos.x, particles[t].pos.y);
					}
				}
				init();
			}
			var inputTest = "你好";
			layer.confirm('用烟花写字,可以自己输入,建议电脑观看', {
				end: start,
				btn: ['输入','默认'] //按钮
			}, function(){
				layer.prompt({
				  value: '开心点',
				  title: '请输入值',
				  end: start
				}, function(value, index, elem){
					inputTest = value;
					layer.close(index);
				});
			});
			var temp = true;
			function start(){
				if(temp){
					layer.msg('开始了,点击空白处也可释放烟花', {
					  time: 2000, //20s后自动关闭
					});
					new yanhua(inputTest);
				}
				temp = false;
			}
		</script>
	</body>
</html>
